Haeeison h



(N0 Model.)

H. H. TAYLOR.

CLAMP. I 110.266.920. Patented Dot. 31, 1882.

G r A I WITNESSES I [MENTOR Afforney NITED STATES P TENT OFFICE.

HARRISON H. TAYLOR, OF DETROIT, MICHIGAN, ASSIGNOR, BY DIRECT AND MESNEASSIGNMENTS, TO THOMAS RENO AND THE DETROIT TOOL COM- PANY, OF SAMEPLACE.

CLAMP.

SPECIFICATION forming part of Letters Patent No. 266,920, dated October31, 1882. Application filed July 18, 1882. (No model.)

To all whom it may concern;

Be it known that I, HARRISON H. TAYLOR, of Detroit, county of Wayne,State of Michigan, have invented a new and useful Improvement in HandScrew-Clamps; and I declare the following to be a full, clear, and exactdescliption of the invention, such as will enable others skilled in theart to which it pertains to make and use it, reference being had to theaccompanying drawings, which form a part of this specification.

My invention consists of the combination of devices and applianceshereinafter specified, and more particularly pointed outin the claims.

In the drawings, Figurel isa side elevation of an apparatus embodying myinvention, showing parts in section. Fig. 2 represents separate views ofthe toggle mechanism.

My invention relates to hand screw-clamps, and is designed especially asan improvement upon a clamp for which an application was filed May 9,1882, by Thomas Reno, Serial No. 60,833, which was allowed June 12,1882.

In carrying out my invention A and A represent the twojaws.

B and B are the ratchet-bars on which the ratchet-teeth are formed,projected in opposite directions. Theratchet-bar B, nearest thefree endsof the jaws, is provided with a screw-cut tang, b, and a handle, 1),adapted to engage with said tang. It is also preferably provided with aspring, 12 which is held in place between the shoulder a in the jaw Aand the shoulder 1) upon the ratchet-bar. The ratchet-bar B is securedin the jaw A without a handle. I prefer that said bar should be rigid-1y secured ill said jaw, though it may be pivoted therein, if desired,without departing from the principle of my invention. The jaw A isconstructed with a slot, G.

D and D represent ratchet blades or pawls, constructed with a series ofratchet-teeth adapted to engage with the ratchet-bars B and B. The pawlsare pivoted one at the top andone at the bottom, as shown at d and d,and preferably provided with notches adapted to receive and secure theends of toggle-levers E and E E is a revolving cam-shaped disk,preferably constructed as shown in the drawings, pivoted on the shaft 6,and provided with a suitable handle or thumb-piece, 6. It is alsoconstructedwith suitable notches, 0 upon its periphery, adapted toreceive the ends of the levers or arms E and E Said arms I prefer toconstruct in free and separate parts, with heads adapted to he slippedin and easily secured in the notches upon the pawls D and D. The wholeconstruction of the disk E and the levers E and E is that of adouble-acting tog- 6o gleadapted to engage and disengage the pawls D andD with the ratchet-bars B andB, when the disk is rotated ill the properdirection, by means of the thumb-piece c.

0 is a stop secured to the jaw to limit the backward movement of thethumb-piece.

The operation of the device will now be understood. By projecting thethumb-piece 6 forward the pawls D and D are disengaged from theratchet-bars, when the two jaws of the 7o clamp may be readily andquickly adjusted upon the wood and secured ill that position by forcingthe thumb-piece in the opposite direction and engaging the pawls withthe ratchetbars. Then by turning the one handle, I), the jaws may becaused to grip with any required force.

It will be observed that this mechanism is much stronger and moredurablethan the spring-pawls used in the former device referred 8o to forengagement with the ratchet-bars. It permits of a much easier adjustmentof the jaws and secures an increased number of teeth upon the pawls forengagement with the teeth upon the ratchet-bars. Moreover, the teeth maybe out much closer together, whereby a more even adjustment of the jawsmay be secured.

It is evident that the construction of the toggle mechanism is such thatthe different parts 0 may easily be replaced, it required, as in theirmanufacture the several parts would all be duplicates.

It will be seen, again, that this device is simpler than that alreadyapplied for, in that it 5 dispenses with one of the handles, as it notonly provides for an easier adjustment of the jaws upon the wood, butdispenses, also, with one of the handles and the necessity of screwingup and unscrewing two handles to tighten 10o nection with one of thehandles, cheapening as well as simplifying the construction.

What I claim is- I 1. A hand screw-clamp consisting of ajaw providedwith two ratchet-bars, one of which has a screw-cut tang andengaging-handle, a jaw arranged to be adjusted on the ratchetbars, twopawls arranged to swing in recesses formed in the adjustable jaw toengage and disengage the ratchet-bars, and toggle mechanism connectedwith the said pawls and serving to positively swing them both in engaging and disengaging the ratchet-bars, substantially as described.

2. Ahand screw-clamp consisting ofa jaw provided with two ratchet-bars,one of said bars provided with a screw-cut tang, aneugaging-handle, andsuitable spring, and in connection therewith a jaw adapted to beadjusted upon the ratchet-barsrand provided with pawls constructed witha series of teeth adapted to engage with the ratchet-bars, and adoubleaoting toggle mechanism adapted to operate saidpawls,.substantially as described.

3. A hand screw-clamp combining in its structure a jaw carrying tworatchet-bars, a jaw adjustable thereon and provided with two swingingpawls, and operating mechanism consisting ofa pivoted cam-shaped diskhaving a projectingthumb-piece, and twolever-armsconnecting the diskwith the pawls, substantially as described.

4. Ahand screw-clamp composed of two jaws united by two ratchet-bars,one of which has a screw-cut tang and en gaging-h andle, a set of pawlsarranged to swing on one of said jaws, and operating mechanismconsisting of two lever-arms and a disk having thumb-piece, said diskand lever-arms serving to positively swing the p'awls iuboth theirmovements to engage and. disengage the ratchet-bars, substantially asdescribed. a o

In testimony whereof I sign this specification in the presence of twowitnesses.

HARRISON H. TAYLOR.

Witnesses: I

W. H. JACKSON, J. EDWARD WARREN.

